YSlow analyzes web pages and tells you why they're slow based on the rules for high performance web sites. YSlow is a Firefox add-on integrated with the popular Firebug web development tool.
Selenium IDE is an integrated development environment for Selenium tests. It is implemented as a Firefox extension, and allows you to record, edit, and debug tests. Selenium IDE includes the entire Selenium<sep/>
MozLab is a suite of tools and libraries that help make your life easier and your time more productive as a developer of AJAX and Mozilla applications. WITH EMACS INTEGRATION.